CN107818890B

CN107818890B - Leakage protector

Info

Publication number: CN107818890B
Application number: CN201711202788.4A
Authority: CN
Inventors: 徐利军
Original assignee: CHANGSHU SOUTH GAROEN ELECTRICAL PRODUCTS CO LTD
Current assignee: CHANGSHU SOUTH GAROEN ELECTRICAL PRODUCTS CO LTD
Priority date: 2017-11-27
Filing date: 2017-11-27
Publication date: 2020-03-06
Anticipated expiration: 2037-11-27
Also published as: CN107818890A

Abstract

The utility model provides a leakage protector, includes casing, the trip gear of installation in the casing down, one with the casing lid of casing down and join in marriage last casing, characteristics: the tripping device comprises a base, an electronic circuit board arranged above the base, a coil arranged on the left side of the length direction of the base and electrically connected with the electronic circuit board, a mutual inductor arranged on the right side of the length direction of the base and electrically connected with the electronic circuit board, a pair of fixed contacts arranged on the base and penetrating the mutual inductor and a pair of moving contacts arranged on the base and matched with the fixed contacts. The structure can complete the assembly of the coil, the mutual inductor and the pressing block after the base and the electronic circuit board are fixed, avoids the difficulty existing in the prior art when the back side of the electronic circuit board is subjected to spot welding operation and the embarrassment of the mutual inductor caused by insufficient installation space, is beneficial to simplifying the whole structure, reduces the assembly difficulty, improves the production efficiency and greatly reduces the production cost.

Description

Leakage protector

Technical Field

The invention belongs to the technical field of power utilization safety protection, and particularly relates to a leakage protector.

Background

The leakage protector is an indispensable matching device for protecting electric appliances, wherein the small leakage protector is particularly widely applied, and particularly can play a role in quickly cutting off a power supply when electric appliances have leakage in power circuits with small power and needing to perform terminal leakage protection, such as switches, sockets or power strips.

The technical information about the leakage protector is not lacked in the published Chinese patent document, and the typical leakage protector is 'a leakage protector' recommended by Chinese patent application publication No. CN103474298A, which comprises a shell, a circuit board and a working assembly, wherein the circuit board and the working assembly are arranged in the shell, the working assembly comprises a reset button and a test button which are positioned above the circuit board, a movable contact group, a static contact group, a magnetic ring and a coil which are positioned below the circuit board, a contact point of the test button directly acts on the circuit board, a spring is sleeved on a hook of the reset button and penetrates through the circuit board, the magnetic ring is positioned at one side of the hook, the coil is stacked below the magnetic ring, an iron core is inserted in the coil, a locking piece is movably arranged at one end of the iron core corresponding to the hook, and a clamping groove matched with. The magnetic ring (i.e. the mutual inductor) and the coil are arranged below the circuit board in an up-down superposition mode, the structural form ensures that the magnetic ring and the coil are arranged on the base before the circuit board, spot welding operation is required to be carried out from the back of the circuit board during wiring, in addition, in order to not influence the performance of the magnetic ring and reduce the volume of a product, the size and the thickness of the magnetic ring can be strictly controlled and then arranged on the base, the assembly difficulty is increased, the assembly efficiency is greatly reduced, the technical requirements on the size and the performance of the mutual inductor are correspondingly improved, and the production cost is invisibly increased.

In view of the above, there is a need for a small earth leakage protector that can be assembled quickly and has no special requirements on the size of the transformer. Therefore, the applicant has made active and effective researches and finally has developed the technical solutions to be described below.

Disclosure of Invention

The invention aims to provide a leakage protector, which is beneficial to optimizing a base structure so as to quickly assemble a mutual inductor and a coil after an electronic circuit board is installed, avoids the difficulties in spot welding operation on the back side of the electronic circuit board and the embarrassment of the mutual inductor caused by insufficient installation space in the prior art, is beneficial to simplifying the whole structure, reduces the assembly difficulty, improves the production efficiency and greatly reduces the production cost.

The task of the invention is completed in this way, a leakage protector comprises a lower shell, a tripping device arranged in the lower shell, and an upper shell matched with the lower shell in a covering way, and is characterized in that: the tripping device comprises a base, an electronic circuit board arranged above the base, a coil arranged on the left side of the length direction of the base and electrically connected with the electronic circuit board, a mutual inductor arranged on the right side of the length direction of the base and electrically connected with the electronic circuit board, a pair of fixed contacts arranged on the base and penetrating the mutual inductor and a pair of moving contacts arranged on the base and matched with the fixed contacts.

In a specific embodiment of the invention, the base is provided with a coil installation cavity with openings at the upper side and the left side in the middle of the left end in the length direction, the bases at the front side and the rear side of the coil installation cavity are respectively provided with a clamping groove, the base is provided with a mutual inductor installation plate protruding towards the right side in the middle of the right end in the length direction, the bases at the front side and the rear side of the mutual inductor installation plate are respectively provided with an input end installation hole at the position corresponding to the clamping groove, and the bases at the front side and the rear side of the mutual inductor installation plate are respectively provided with a slot at the position of the bottom; the electronic circuit board is clamped and fixed above the height direction of the base through fixing pins which respectively extend upwards from the middle parts of the front side and the rear side of the base; the mutual inductor is sleeved on the mutual inductor mounting plate and is electrically connected with a circuit above the electronic circuit board, an input end mounting hole is internally provided with an input plate, the static contacts are respectively clamped in a slot, one end of each static contact is bent and extended oppositely and extends into a central hole in the middle of the mutual inductor, the end part of the other end of each static contact is downward to form a static contact, the adjacent input plates and the static contacts are connected through a connecting plate respectively, one end of each connecting plate is connected with the end part of the lower end of each input plate, the other end of each connecting plate is bent and extends into the central hole in the middle of the mutual inductor and is connected with one end; an output plate and a moving contact are respectively abutted against each other in the clamping groove and are embedded together, the output plate extends downwards in the clamping groove and a piezoresistor connector is formed at the end part of the output plate, one end of the moving contact extends upwards along the corresponding output plate and is respectively electrically connected with a circuit above the electronic circuit board, the other end of the moving contact is respectively bent and extends towards the direction of the static contact, and a moving contact matched with the corresponding static contact is formed at the end part of the moving contact; the coil is arranged in the coil mounting cavity and is electrically connected with a circuit above the electronic circuit board.

In another specific embodiment of the invention, a pressing block installation cavity communicated with the coil installation cavity is arranged in the middle of the base in the length direction; the tripping device further comprises a pressing block, the pressing block is arranged in the pressing block mounting cavity in a vertically sliding mode, a pressing rod is arranged at the bottom of the pressing block in the height direction and in the front-back direction in an extending mode respectively, the pair of pressing rods are abutted against a pair of movable contacts from the lower side respectively, a reset hole which penetrates through the pressing block from top to bottom is formed in the middle of the pressing block, a reset rod which penetrates through the electronic circuit board and the base sequentially is inserted into the reset hole, a sliding groove is formed in one side face, facing the coil, of the pressing block, a locking plate is arranged in the sliding groove in a left-right sliding mode, one end of the locking plate is provided with a U-shaped opening, one end of an iron core in the U-shaped opening and the coil is clamped with one end of the iron core, the other end of the.

In another specific embodiment of the present invention, the reset rod is sleeved with a reset spring, one end of the reset spring abuts against the electronic circuit board, and the other end of the reset spring abuts against a reset button formed at the upper end of the reset rod.

In a further embodiment of the present invention, a coil return spring for urging the iron core to move to the right side is provided in the coil.

In still another specific embodiment of the present invention, a moving contact trip spring seat is further disposed on the bases on the front and rear sides of the coil installation cavity, the moving contact trip spring seat is provided with a moving contact trip spring cavity with a downward opening, and a moving contact trip spring with one end abutting against the bottom of the cavity and the other end abutting against the moving contact is disposed in the moving contact trip spring cavity.

In a further specific embodiment of the present invention, the bottom of the base at both sides of the left end in the length direction is respectively provided with a varistor for electrically connecting with a corresponding varistor connector on the output board.

In a more specific embodiment of the present invention, the middle parts of the upper housing and the lower housing at the front and rear sides are respectively connected to each other by a buckle, and the four corners of the lower housing are respectively connected to the upper housing by screws; the upper shell is provided with a reset button yielding hole, the upper shell is also provided with a test button and a light guide plate, the test button is electrically connected with a test device which is arranged above the electronic circuit board and used for providing a leakage tripping signal, and the light guide plate is matched with an indicator lamp above the electronic circuit board.

In yet another specific embodiment of the present invention, the upper ends of the pair of output plates and the pair of input plates extend to the left and right sides respectively and then are bent downward to form the connecting portions.

In a further embodiment of the present invention, the movable contact is a bimetal bent downward after heating.

After adopting the structure, the invention has the advantages that: the coil installation cavity that is used for installing the coil is offered to the base at length direction's left end, the right-hand member constitutes and is equipped with the briquetting installation cavity that is used for installing the briquetting in mutual-inductor mounting panel and the middle part that is used for installing the mutual-inductor, and realize the electricity at the upper surface of electronic circuit board respectively and connect, this kind of structure can accomplish the assembly to the coil after base and electronic circuit board are fixed, mutual-inductor and briquetting, the difficulty that exists when having avoided among the prior art to electronic circuit board reverse side spot welding operation and the awkwardness that meets because of installation space is not enough to the mutual-inductor, be favorable to simplifying overall structure, reduce the assembly degree of difficulty, the production efficiency is improved, greatly.

Drawings

Fig. 1 is a structural diagram of a trip device 1 of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

In the figure: 1. the transformer testing device comprises a tripping device, 11, a base, 111, a coil mounting cavity, 112, a clamping groove, 113, a press block mounting cavity, 114, a transformer mounting plate, 115, an input end mounting hole, 116, a slot, 117, a fixed pin, 118, a moving contact tripping spring seat, 1181, a moving contact tripping spring, 12, an electronic circuit board, 121, a testing device, 122, an indicator light, 13, a transformer, 14, an input plate, 141, a connecting plate, 15, a fixed contact, 151, a fixed contact, 16, an output plate, 161, a piezoresistor connector, 1611, a piezoresistor, 17, a moving contact, 171, a moving contact, 18, a coil, 181, an iron core, 19, a press block, 191, a press rod, 192, a reset hole, 1921, a reset rod, 19211, a bayonet, 1922, a reset spring, 1923, a reset button, 193, a sliding groove and; 2. a lower housing; 3. the test button comprises an upper shell, 31, a test button, 32, a light guide plate and 33, a reset button abdicating hole.

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are given with respect to the present position of fig. 1 and 2, and thus should not be interpreted as limiting the technical solution provided by the present invention.

Referring to fig. 1 and fig. 2, the present invention relates to a leakage protector, which includes a lower housing 2, a trip device 1 installed in the lower housing 2, and an upper housing 3 covering the lower housing 2, wherein the trip device 1 includes a base 11, an electronic circuit board 12 installed above the base 11, a coil 18 installed on the left side of the length direction of the base 11 and electrically connected to the electronic circuit board 12, a transformer 13 installed on the right side of the length direction of the base 11 and electrically connected to the electronic circuit board 12, a pair of stationary contacts 15 installed on the base 11 and penetrating through the transformer 13, and a pair of moving contacts 17 installed on the base 11 and cooperating with the stationary contacts 15.

Furthermore, the middle part of the left end of the base 11 in the length direction is provided with a coil installation cavity 111 with an opening at the upper part and the left side, the bases 11 at the front and the back sides of the coil installation cavity 111 are respectively provided with a clamping groove 112, the base 11 protrudes to the right side in the middle part of the right end in the length direction to form a transformer installation plate 114, the bases 11 at the front and the back sides of the transformer installation plate 114 are respectively provided with an input end installation hole 115 at a position corresponding to the clamping groove 112, and the bases 11 at the front and the back sides of the transformer installation plate 114 are respectively provided with a slot 116 at a position at the bottom; the electronic circuit board 12 is clamped and fixed above the height direction of the base 11 through fixing pins 117 which respectively extend upwards from the middle parts of the front side and the rear side of the base 11; the mutual inductor 13 is sleeved on the mutual inductor mounting plate 114 and is electrically connected with a circuit above the electronic circuit board 12, an input plate 14 is respectively inserted in the input end mounting hole 115, the static contacts 15 are respectively clamped in an insertion groove 116, wherein one end of each static contact 15 is respectively bent and extended oppositely and extends into a central hole in the middle of the mutual inductor 13, the other end of each static contact 15 is downward to respectively form a static contact 151, the adjacent input plates 14 and the static contacts 15 are respectively connected through a connecting plate 141, one end of each connecting plate 141 is connected with the lower end of each input plate 14, and the other end of each connecting plate 141 is bent and extends into the central hole in the middle of the mutual inductor 13 and is connected with one end of the static; the clamping groove 112 is internally and mutually abutted and jointly embedded with an output plate 16 and a moving contact 17, the output plate 16 extends downwards in the clamping groove 112 and is provided with a piezoresistor connector 161 at the end part, the bottom of the base 11 at the left end of the length direction is respectively provided with a piezoresistor 1611 which is electrically connected with the corresponding piezoresistor connector 161 on the output plate 16, the moving contact 17 is preferably a bimetallic strip with the end part bent downwards of a heated moving contact 171, one end of the moving contact extends upwards along the corresponding output plate 16 and is respectively electrically connected with a circuit above the electronic circuit board 12, and the other end of the moving contact is respectively bent and extends towards the direction of a static contact 15 and is provided with a moving contact 171 matched with the corresponding static contact 151 at the end part; the coil 18 is arranged in the coil mounting cavity 111 and electrically connected with a circuit above the electronic circuit board 12, and a coil return spring for pushing the iron core 181 to move towards the right side is arranged in the coil 18. The upper ends of the pair of output plates 16 and the pair of input plates 14 extend to the left and right sides, respectively, and then are bent downward to form connecting parts.

Furthermore, a pressing block installation cavity 113 communicated with the coil installation cavity 111 is arranged in the middle of the base 11 in the length direction; the trip device 1 further comprises a press block 19, the press block 19 is arranged in the press block mounting cavity 113 in a vertically sliding manner, a press rod 191 is respectively arranged at the bottom of the press block 19 in the height direction and in the front-back direction in an extending manner, the pair of press rods 191 respectively abut against a pair of movable contacts 17 from the lower side, a reset hole 192 penetrating through the press block 19 from the upper side to the lower side is formed in the middle of the press block 19, a reset rod 1921 sequentially penetrating through the electronic circuit board 12 and the base 11 is inserted into the reset hole 192, a sliding groove 193 is formed in the side surface of the press block 19 facing the coil 18, a locking plate 194 is arranged in the sliding groove 193 in a vertically sliding manner, a U-shaped opening is formed at one end of the locking plate 194, the U-shaped opening is mutually clamped with one end of an iron core 181 in the coil 18, the other end of the locking plate slides in the sliding groove 193 and is matched with. A reset spring 1922 is sleeved on the reset rod 1921, one end of the reset spring 1922 abuts against the electronic circuit board 12, and the other end of the reset spring 1922 abuts against a reset button 1923 formed at the upper end of the reset rod 1921.

Further, a moving contact trip spring seat 118 is respectively arranged on the bases 11 at the front side and the rear side of the coil installation cavity 111, a moving contact trip spring cavity with a downward opening is formed in the moving contact trip spring seat 118, and a moving contact trip spring 1181 with one end abutting against the bottom of the cavity and the other end abutting against the moving contact 17 is respectively arranged in the moving contact trip spring cavity.

Furthermore, the middle parts of the front and rear sides of the upper shell 3 and the lower shell 2 are respectively connected with each other through a buckle, and the four corners of the lower shell 2 are respectively connected with the upper shell 3 through screws; the upper shell 3 is provided with a reset button abdicating hole 33, the upper shell 3 is also provided with a test button 31 and a light guide plate 32, the test button 31 is electrically connected with a test device 121 which is arranged above the electronic circuit board 12 and used for providing a leakage tripping signal, and the light guide plate 32 is matched with an indicator lamp 122 above the electronic circuit board 12.

Referring to fig. 1 in combination with fig. 2, when the reset button 1923 is pressed, the lower reset rod 1921 displaces downward and compresses the reset spring 1922 to store energy, when the lower end of the reset rod 1921 pushes the lock plate 194 away and the bayonet 19211 and the lock plate 194 are engaged with each other, since the lock plate 194 is connected to the press block 19, when the reset button 1923 is released and the reset spring 1922 rebounds, the reset rod 1921 drives the lock plate 194, the press block 19 and the press rod 191 thereof to move upward, the press rod 191 overcomes the acting force of the movable contact trip spring 1181 to move the movable contact 171 on the movable contact 17 upward during the rising process, and the movable contact 171 contacts the stationary contact 151 to complete the circuit.

When the circuit has a leakage situation, the transformer 13 generates an induced current and outputs the induced current to the electronic circuit board 12, the loop on the electronic circuit board 12 is connected to electrify the coil 18 to generate a magnetic field, and the iron core 181 is displaced to the left after overcoming the elastic force of the coil return spring, the iron core 181 drives the locking plate 194 to slide to the left, so that the locking plate 194 is released from the bayonet 19211, and the movable contact 171 is contacted with the stationary contact 151 only under the action of the upward push-pull action of the pressing rod 191, so that when the locking plate 194 is released, the movable contact 17 pushes the pressing block 19 and the pressing rod 191 to move downward together under the action of the pressing rod tripping spring 1181, and the movable contact 171 is separated from the stationary contact 151, thereby cutting off the power supply to realize the leakage protection of the.

When the test button 31 is pressed, the test device 121 simulates and inputs a leakage current, the signal is amplified through the electronic circuit board 12, the tripping device 1 is triggered to work, the iron core 181 is displaced leftwards, and the purpose of cutting off the power supply is realized according to the operation process; conversely, the reset button 1923 is pressed to achieve the purpose of turning on the power supply by the operation process.

Claims

1. The utility model provides a leakage protector, includes casing (2) down, one installation trip gear (1) in casing (2) down, one with casing (2) down cover the last casing (3) of joining in marriage, its characterized in that: the tripping device (1) comprises a base (11), an electronic circuit board (12) arranged above the base (11), a coil (18) arranged on the left side of the length direction of the base (11) and electrically connected with the electronic circuit board (12), a mutual inductor (13) arranged on the right side of the length direction of the base (11) and electrically connected with the electronic circuit board (12), a pair of static contacts (15) arranged on the base (11) and penetrating through the mutual inductor (13) and a pair of movable contacts (17) arranged on the base (11) and matched with the static contacts (15);

the coil mounting structure is characterized in that a coil mounting cavity (111) with openings on the upper side and the left side is formed in the middle of the left end of the base (11) in the length direction, clamping grooves (112) are formed in the bases (11) on the front side and the rear side of the coil mounting cavity (111) respectively, a transformer mounting plate (114) protrudes towards the right side from the middle of the right end of the base (11) in the length direction, an input end mounting hole (115) is formed in the positions, corresponding to the clamping grooves (112), of the bases (11) on the front side and the rear side of the transformer mounting plate (114), and a slot (116) is formed in the positions, located at the bottom, of the bases (11) on the front side and the rear side of the transformer mounting plate (114); the electronic circuit board (12) is clamped and fixed above the height direction of the base (11) through fixing pins (117) which respectively extend upwards from the middle parts of the front side and the rear side of the base (11);

the mutual inductor (13) is sleeved on the mutual inductor mounting plate (114) and is electrically connected with a circuit above the electronic circuit board (12), an input plate (14) is respectively inserted into the input end mounting holes (115), the static contacts (15) are respectively clamped in a slot (116), one end of each static contact (15) is respectively bent and extended towards each other and extends into a central hole in the middle of the mutual inductor (13), the end part of the other end of each static contact is downward to form a static contact (151), the adjacent input plates (14) and the static contacts (15) are respectively connected through a connecting plate (141), one end of each connecting plate (141) is connected with the end part of the lower end of each input plate (14), and the other end of each connecting plate is bent and extends into the central hole in the middle of the mutual inductor (13) and is connected with one end of the static contact (15); an output plate (16) and a movable contact (17) are respectively abutted against each other and embedded together in the clamping groove (112), the output plate (16) extends downwards in the clamping groove (112) and a piezoresistor connector (161) is formed at the end part, one end of the movable contact (17) extends upwards along the corresponding output plate (16) and is respectively electrically connected with a circuit above the electronic circuit board (12), the other end of the movable contact respectively bends towards the direction of the static contact (15) and extends, and a movable contact (171) matched with the corresponding static contact (151) is formed at the end part; the coil (18) is arranged in the coil mounting cavity (111) and is electrically connected with a circuit above the electronic circuit board (12).

2. A leakage protector according to claim 1, characterized in that the base (11) is provided with a press block mounting cavity (113) in the middle part in the length direction, the press block mounting cavity being communicated with the coil mounting cavity (111); the tripping device (1) further comprises a pressing block (19), the pressing block (19) is arranged in the pressing block mounting cavity (113) in a vertically sliding mode, a pressing rod (191) is respectively arranged at the bottom of the pressing block (19) in the height direction and in the front-back direction in an extending mode, the pair of pressing rods (191) are respectively abutted against a pair of moving contacts (17) from the lower portion, a reset hole (192) which penetrates through the pressing block (19) vertically is formed in the middle of the pressing block (19), a reset rod (1921) which sequentially penetrates through the electronic circuit board (12) and the base (11) is inserted into the reset hole (192), a sliding groove (193) is formed in the side face, facing the coil (18), of the pressing block (19), a locking plate (194) is installed in the sliding groove (193) in a left-right sliding mode, a U-shaped opening is formed at one end of the locking plate (194), and the U-shaped opening and one end of an iron core (181) in, And the other end slides in the sliding groove (193) and is matched with a bayonet (19211) formed at the lower end of the reset rod (1921).

3. A earth-leakage protector according to claim 2, characterized in that the reset rod (1921) is sleeved with a reset spring (1922), one end of the reset spring (1922) abuts against the electronic circuit board (12) and the other end abuts against a reset button (1923) formed at the upper end of the reset rod (1921).

4. A leakage protector according to claim 1, characterized in that the coil (18) is provided with a coil return spring for urging the plunger (181) to move to the right.

5. A leakage protector according to claim 1, wherein a moving contact trip spring seat (118) is further provided on the base (11) at the front and rear sides of the coil installation cavity (111), the moving contact trip spring seat (118) is provided with a moving contact trip spring cavity with a downward opening, and a moving contact trip spring (1181) with one end abutting against the bottom of the cavity and the other end abutting against the moving contact (17) is provided in the moving contact trip spring cavity.

6. A leakage protector according to claim 1, wherein the base (11) is provided with a varistor (1611) at the bottom of each of the left and right sides of the length direction for electrically connecting with a corresponding varistor connector (161) on the output board (16).

7. A leakage protector according to claim 1, wherein the upper case (3) and the lower case (2) are connected to each other by a snap at the middle of the front and rear sides, respectively, and are connected to the upper case (3) by screws at the four corners of the lower case (2), respectively; go up casing (3) on seted up reset button hole (33) of stepping down, still install a test button (31) and a light guide plate (32) on last casing (3), test button (31) be used for providing electric leakage trip signal's testing arrangement (121) electricity with electronic circuit board (12) top and be connected, and light guide plate (32) cooperate with pilot lamp (122) of electronic circuit board (12) top.

8. A leakage protector according to claim 1, wherein the upper ends of the pair of output plates (16) and the pair of input plates (14) extend to the left and right sides, respectively, and then are bent downward to form connecting portions.

9. A leakage protector according to claim 1, characterized in that the movable contact (17) is a bimetallic strip bent downwards at the end of the movable contact (171) after heating.